//
//  UIButton+LBEnlargeEdge.m
//  app
//
//  Created by 刘文扬 on 17/6/12.
//  Copyright © 2017年 Duke_Lee. All rights reserved.
//

#import "UIButton+LBEnlargeEdge.h"
#import <objc/runtime.h>

@implementation UIButton (LBEnlargeEdge)

static char topNameKey;

static char rightNameKey;

static char bottomNameKey;

static char leftNameKey;



- (void)setEnlargeEdge:(CGFloat) size

{
    
    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
}



- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left

{
    
    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
    objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
}



- (CGRect)enlargedRect

{
    
    NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);
    
    NSNumber* rightEdge = objc_getAssociatedObject(self, &rightNameKey);
    
    NSNumber* bottomEdge = objc_getAssociatedObject(self, &bottomNameKey);
    
    NSNumber* leftEdge = objc_getAssociatedObject(self, &leftNameKey);
    
    if (topEdge && rightEdge && bottomEdge && leftEdge)
        
    {
        
        return CGRectMake(self.bounds.origin.x - leftEdge.floatValue,
                          
                          self.bounds.origin.y - topEdge.floatValue,
                          
                          self.bounds.size.width + leftEdge.floatValue + rightEdge.floatValue,
                          
                          self.bounds.size.height + topEdge.floatValue + bottomEdge.floatValue);
        
    }
    
    else
        
    {
        
        return self.bounds;
        
    }
    
}



- (UIView*)hitTest:(CGPoint) point withEvent:(UIEvent*) event

{
    
    CGRect rect = [self enlargedRect];
    
    if (CGRectEqualToRect(rect, self.bounds))
        
    {
        
        return [super hitTest:point withEvent:event];
        
    }
    
    return CGRectContainsPoint(rect, point) ? self : nil;
    
}



@end
